btc-wallet-* Scratch Code

xpub

=xpub1 'zpub6r8dKyWJ31XF6n69KKeEwLjVC5ruqAbiJ4QCqLsrV36Mvx9WEjUaiPNPGFLHNCCqgCdy6iZC8ZgHsm6a1AUTVBMVbKGemNcWFcwBGSjJKbD'
=xpub2 'xpub6D7yaZieZEeG617UcKXDhbsDeso6bmxSAiGWkvkASoiwcjaRtrH5HeNRnDT25s7zmxYzj6MtFe32dVqcf9YcBKKgn9THHjwn2uSjkvobK4e'
=bl -build-file %/lib/btc-wallet-store/hoon

add

:btc-wallet-store|action [%add-wallet xpub ~ ~]

get address at indices

=walt1 (from-xpub:walt:bl xpub1 ~ ~)
(get-address:walt1 %0 0)

update address data

=walt1 (from-xpub:walt:bl xpub1 ~ ~)
(~(mk-address walt1 %0) 0)
::  gives bc1q0adfj7ur750hjwufzzlfj5ytqzsnd7fz9fjuzc
=walt1 (~(insert-address walt1 %0) [%bech32 'bc1q0adfj7ur750hjwufzzlfj5ytqzsnd7fz9fjuzc'] [%0 0 ~])
nixt.st.walt1
::  gives [p=1 q=0] (nixt updated since it was 0)
=walt1 (~(insert-address walt1 %0) [%bech32 'bc1qa5jcdww8u8493zttjjf6q5wu89e6knpvmsh7x4'] [%0 2 ~])
nixt.st.walt1
::  gives [p=1 q=0] (no update)
=walt1 (~(insert-address walt1 %0) [%bech32 'bc1qvqrdh8suyv63ntaa0d7hmcamavv8283sngh6e5'] [%0 1 ~])
nixt.st.walt1
::  gives [p=3 q=0]  (skips index 2, since already a used address there)

=walt1 (insert-address:walt1 [%bech32 'bc1qvqrdh8suyv63ntaa0d7hmcamavv8283sngh6e5'] [%0 4 ~])
::  gives error, because address is inserted at the wrong index

generate new address (for receiving payment)

=walt1 (from-xpub:walt:bl xpub1 ~ ~)
=res ~(gen-address walt1 %0)
p.res
nixt.st.q.res
::  gives 
::  [%bech32 'bc1q0adfj7ur750hjwufzzlfj5ytqzsnd7fz9fjuzc']
::  [p=1 q=0]

Algos

Scan addresses

types
- req-id=@ux: hash160 of (cat xpub chyg)
maps:
- scans ([xpub chyg] -> waltscan)
- pend/fail: (req-id -> [=idx key=[xpub chyg]])
- timeouts: (req-id -> @da) -- store Behns for each req
start scan
- get nixt from wallet
- generate
- store their indexes in scan
- send address+ idx [xpub chyg] to provider

in wallet-hook

send address-watch req
- send address to provider with req-id
- set a Behn for 30s, put in timeouts
on response from server
- check whether idx in scanning--ignore if not (old response)
- insert the address into the wallet if it's used
- if used, update has-used for this xpub to be true
- delete idx from scanning jug
- check whether scanning is now empty. If it is, check whether has-used is true
on error
on timeout

Monitor addresses

nixt also stores next 50 addresses for each account.
every update-address call also checks those

:: ++ send-address-update |= [xpub=tape =walt a=address:btc us=(set utxo)] ^- (quip card state) : state(walts (~(put by walts.state) xpub walt)) ~%give %fact ~[/wallets] %btc-wallet-store-update !>([%address a us]) ::

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